I heard that it was because so many men served in the military during WWII. I still have nightmares where I can’t find my Cover.
After 40 plus years, I still have similar dreams. Some part of the uniform I can't find or all I have available are really crappy shoes or dirty uniforms.
You'd think that would go away after 40 some years. It's not a frequent dream by any means but it does pop up sometimes.